Title:
HIGH-MN STEEL AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2019/112012
Kind Code:
A1
Abstract:
Provided is a high-Mn steel having exceptional high strength and low-temperature toughness, and furthermore having exceptional low-temperature CTOD characteristics. The high-Mn steel has: a component composition comprising, in percent by mass, 0.10-0.70% of C, 0.05-0.50% of Si, 20-30% of Mn, 0.030% or less of P, 0.0070% or less of S, 0.01-0.07% of Al, 0.5-7.0% of Cr, at least 0.01% and less than 0.1% of Ni, 0.0005-0.0050% of Ca, 0.0050-0.0500% of N, 0.0050% or less of O, less than 0.0050% of Ti, and less than 0.0050% of Nb, the balance being Fe and unavoidable impurities; and a structure having austenite as a matrix phase; the austenite having a grain size of 1 μm or greater and a standard deviation of 9 μm or less.
Inventors:
NAKASHIMA KOICHI (JP)
UEDA KEIJI (JP)
KITSUYA SHIGEKI (JP)
ARAO RYO (JP)
IZUMI DAICHI (JP)
IGI SATOSHI (JP)
ONO TOMOHIRO (JP)
UEDA KEIJI (JP)
KITSUYA SHIGEKI (JP)
ARAO RYO (JP)
IZUMI DAICHI (JP)
IGI SATOSHI (JP)
ONO TOMOHIRO (JP)
Application Number:
PCT/JP2018/044941
Publication Date:
June 13, 2019
Filing Date:
December 06, 2018
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C22C38/58
Foreign References:
| JP2016196703A | 2016-11-24 | |||
| JP2017507249A | 2017-03-16 | |||
| JP2017155300A | 2017-09-07 | |||
| JPS56258A | 1981-01-06 | |||
| CN107177786A | 2017-09-19 | |||
| JP2016084529A | 2016-05-19 | |||
| JP2016196703A | 2016-11-24 |
Other References:
See also references of EP 3722448A4
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
Download PDF: